`berlin blue`, a poisonous cyanide compound, hydrocyanic acid, in the subsoil of the construction site for residential buildings

acid berlin black blue build buildings bulldozer civil compound construction contaminated contamination cyan cyanid cyanide digging dirty dispose dump duty earthmover engineering environment equipment excavation excavator filthy for garbage ground heavy hydraulic hydrocyan hydrocyanic industrial industry junk landfill loader machine mechanical organic poisonous reduction remediation residential shovel site soil subsoil technology toxic trucks unhealthy vehicle waste work